Stair construction



F. L. HOLZER STAIR CONSTRUCTION Filed April 22. 1954 INVENT R. fkzazaqaz l. fiazae L LM a? 4;.

36,853.. STAIRCONSTRUCIION Frederick. L...Ho m N Application April 22, 1953;:S 1fl q'm r I @4 2 My invention relates to a new and useful improvement in a stair construction adapted for prefabrication in the form of individual units susceptible of convenient interengaging assembly.

Another object of my invention is the provision of a stair construction of this character of stair risers flexible in that the riser and tread support thereof may be adapted to accommodate itself to the tread and its position.

A further object of my invention is the provision of a stair construction of this character which constitutes a metallic stairway which is both light in weight and fireproof.

Anotherobject of my invention is the provisionof a simple yet eificient shackle for attaching a stair riser to stair Stringer. I

A still further and equally important object of my invention is. the provision of a construction of this character which is simple in use and economical in manufacture.

Other objects will appear hereinafter- The invention consists in the novel combination and United te. a e

arrangement of parts to be hereinafter described and I claimed.

The invention will be best understood by reference to the accompanying drawings showing the preferred form of construction, and in which:

Fig. 1 is a perspective view of a portion of a stairway embodying the construction principles of my invention; Fig.2 is'a side elevational view showing my improved stair riserand -'ts connection to a stairway stringer;

Fig.3 is an end view of the shacklecarried by my improved stair riser;

Fig. 4 is a perspective view of the shackle as employed in my invention; and

Fig. 5 is a view similar to Fig. 4 but showing'fthe parts of the shackle in disassembled form.

the drawings, stair Referring more particularly to I stringers are designated by the numbers 10-and 11. It is preferred that these stringers 10 and 11 take the form of metallic tubular members. g V

Step units of my improved construction are' designed for simple and effective-attachment to the stringers 10 and. 11.; These step units each include a tread 12 together with oppositely related risers 13.. Each riser 13 may be in the form of a flat bar having at its opposite ends angular extensions 15 and 16 providing supports for the tread. The tread supports 15 and 16 extend in opposite directions with respect to each other as viewed in Figs. 1 and 2 and may be of any desired length. Each tread 12 is fixedly attached. in any suitable manner such as by screws 19 to its-respective tread supports 15 and 16. Weight upon the tread 12 will be absorbed by the oppositerisers 13. By attaching each tread 12 to its respective tread supports 15 and 16, the tread 12 will strengthen and maintain the position of the step riser 13 with respect to the latters connection to its respective stringer 10 or 11.

Without affecting the length of the supports a tread r ice ,sections'23; and24. Thesesections23. and24 are adapted.

to: be; placed .toge 'er in confronting relation with respect toeach other. and ii -clamping position upon the stringer asshown in Figs. 4 and 5..

The shackle is fixedly secured to the riser 13 by securing the section 24 to a flat portion 24' formed at the junction between the riser 13 and the tread support 16 as shown in Figs. 2, 4 and 5'. The attachment of the section 24 to the riser 13 may be accomplished in any approved manner such as by spot welding or the like. It' will be noted that the riser has its connection with the section 24 of the shackle 22 at a point where the riser 13 is joined to the tread support 16 and directly to the shackle section 24 which has a point on top of the riser 13.

The other section 23 of the shackle has provided along oneof its ends 23 spaced apart lugs 25 and 26. These lugs 25 and 26 are bent back upon thcmselvesin a direction opposite to the curve of the section 23 asshown in Figs. 4 and 5 to provide a pair of spaced hooks. The corresponding end portion of the other section 24 has formed therein elongated apertures 27 and 28 which are adapted to receive the hooks provided by the curved lugs 25 and 26 of the section 23. Thus, it is apparent that I have provided a simple hinge connection between the shackle sections 23 and 24.

The opposite end of each of the U-shaped'sections 23 and 24 are provided with laterally extending flanges 29 and 30. These flanges 29 and 30 are provided with corresponding apertures 31. It is through these apertures 31 that a fastening element, such as a nut and bolt combination 32 as shown, is adapted to be positioned for securing the shackle 22 in any desired position upon the stringers 10 and 11.

From the foregoing, it is apparent that the placement of the shackle 22 upon these stringers 10 and 11 may be accomplished through the minimum amount of labor and skill.

The riser 13 and tread supports 15 and 16 together with the shackle section 24 may be a single casting.

Theme of my improved construction provides a stair- I way. that is adjustable in construction and one which will afford a safe and fireproof stairway.

sightly appearance when placed in an exposed position.

My improved'invention removes these objectionable traits of former stair constructions.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. 1, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claim.

Having thusdescribed my invention. what I claim as new and desire to protect by Letters Patent is:

A stair construction comprising a pair of parallelly extending tubular stringers, Z-shaped supporting members formed from a relatively fiat bar bent to provide a riser portion and reversely extending top and bottom tread supporting portions of substantially equal length I on opposite ends of said riser portion, said top and bottom t-read supporting portions being of a length equal to half 2,936,863 Ratented- May 175.1960,

supporting members, a removable tread detachably con.-.

meeting said oppositely corresponding tread supporting portions in end abutment with respect to each other, said riser 'portions of'each of said members at'its pointiof junction withsa'idbottom tread supporting portion bent diagonally with respect to saidriser portion and said tread supporting portion and in parallel relation with respect to said stringer to provide a base for an integral U-shaped stringer engaging portion, a second U shaped stringer engaging section cooperating with saidfirst men t-ioned U-shaped stringer engaging portion to form a circular shackle rei'novably embracing said tubular stringer, and means connecting said U-shaped stringer engaging portion and said U-shaped stringer engaging section together to clamp said shackle formed thereby in embracing relation with trespeqt to said stringer, with said riser portion bearing on said first mentioned stringer engaging portion at a point on top of said stringer so as to dispose said riser and said top and bottom tread supporting portions in the same vertical plane with respect to said stringer.

References Cited in the file of this patent UNITED STATES PATENTS 833,746 r Ly1e Oct. 23, 1906 1,70 1 ,659 Bechtel Feb. 12, 1929 FOREIGN. PATENTS: 424,200 Great Britain Feb. 14, 1935 

